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RAS function
: Available, : Not available
Function name
Automatic return
Control station switching
Control station recovery control
Loopback function
Troubleshooting
: Available, : Not available
Function name
Network diagnostics
Applied function
: Available, : Not available
Function name
Interrupt program start
Multiplex transmission function
Send points increase
3 FUNCTION LIST
20
Description
Automatically returns the station disconnected from the network
due to a data link error to the network when it recovers and restarts
data link.
Continues data link with another normal station that serve as a sub-
control station even if the control station goes down.
Shortens network downtime by resolving the cause of an error in
the control station and making that station join the network as a
normal station.
Isolates a faulty area such as a cable disconnection and faulty
station to continue data link connection between normal stations.
Description
Checks the line status of the network and the module setting status.
Description
Checks interrupt conditions at every link scan, and sends an
interrupt request to the CPU module to start the interrupt program if
the interrupt conditions are met.
Performs high speed communication using duplex transmission
path (forward loop and reverse loop). In the environment where the
QJ71LP21-25 with multiplex transmission operates as a control
station, the RJ71LP21-25 is allowed to participate in the network as
a sub-control station or normal station.
Increases the number of send points (a maximum of 2000 bytes per
station) to a maximum of 8000 bytes (when four modules are
mounted) by mounting multiple RJ71LP21-25s with the same
network number to one CPU module.
Availability
Control
Normal
station
station
Availability
Control
Normal
station
station
Availability
Control
Normal
station
station
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